How Much Does Double Glazing Cost? UK Prices for 2026
Double glazing is one of the most popular home improvements in the UK, but prices vary widely depending on the windows you choose. This guide gives you real UK price ranges by window style, frame material and house size, so you know what to expect before you get a quote.
How much do double glazed windows cost?
Double glazing starts from around £400 per window installed for a standard uPVC casement, rising with larger sizes, premium materials and more complex styles. The table below shows typical UK guide prices for a single double glazed window, supplied and fitted.
| Window type | Guide price (supply & fit) |
|---|---|
| uPVC casement | £400–£950 |
| Flush casement | £500–£1,050 |
| Sash window | £700–£1,500 |
| Tilt & turn | £550–£1,150 |
| Bay window | £1,100–£2,400 |
| Aluminium (per window) | £650–£1,300 |
| Timber (per window) | £800–£1,700 |
These are guide prices only. The exact cost depends on the size, colour, glass specification and access at your property, which is why a free survey is the only way to get an accurate, fixed price for your home.
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Double glazing cost by house size
Most homeowners want to know the cost of doing the whole house, not just one window. The table below shows typical UK guide prices for double glazing a full home in uPVC, supplied and fitted, based on the number of windows you are likely to have.
| Property type | Guide price (supply & fit) |
|---|---|
| 1-bed flat (3–4 windows) | £1,800–£3,200 |
| 2-bed terrace (5–6 windows) | £2,800–£5,000 |
| 3-bed semi (8–10 windows) | £4,000–£8,000 |
| 4-bed detached (10–14 windows) | £6,000–£12,000 |
| 5-bed+ detached (14+ windows) | £8,000–£16,000 |
Upgrading to aluminium or timber frames, or adding bay windows and decorative glass, will push your total towards the upper end of these ranges and beyond.
Double glazing cost by window style
Casement windows (£400–£950)
The most popular and cost-effective choice in the UK. Casement windows hinge open at the side or top and suit almost any property, which is why they sit at the affordable end of the range.
Flush casement windows (£500–£1,050)
A premium take on the casement, where the sash sits flush with the frame for a clean, traditional look. Expect to pay a little more than a standard casement for that smoother finish.
Sash windows (£700–£1,500)
Vertically sliding sash windows are ideal for period and heritage homes. The more complex mechanism and traditional detailing make them one of the pricier styles.
Tilt & turn windows (£550–£1,150)
These open inwards in two ways, tilting from the top for ventilation or swinging fully open for easy cleaning. The dual-action hardware adds to the cost over a basic casement.
Bay windows (£1,100–£2,400)
Bay windows project outwards and combine several panes in one structure, so they cost more than a single flat window but add character, light and space to a room.
Double glazing cost by frame material
uPVC (most economical)
uPVC is the most affordable and widely chosen frame material. It is low-maintenance, durable and available in a huge range of colours and finishes, making it the default choice for most UK homes.
Aluminium (around 25–30% more than uPVC)
Aluminium frames are slim, strong and modern, allowing for larger glass areas. Expect to pay roughly 25 to 30 per cent more than the equivalent uPVC window.
Timber (around 50–70% more than uPVC)
Timber offers a premium, authentic look that suits period and conservation properties. It is the most expensive option, typically 50 to 70 per cent more than uPVC, and needs occasional maintenance to stay in top condition.
Is double glazing worth it?
For the vast majority of homeowners, double glazing pays for itself many times over through comfort, savings and added value. Energy-efficient glazing can cut heat loss, lower your heating bills and improve your home's EPC rating, all while making day-to-day living more comfortable.
- ✓ Lower energy bills from reduced heat loss
- ✓ A warmer, comfier home all year round
- ✓ Less condensation and damp on your windows
- ✓ A quieter home with reduced outside noise
- ✓ Improved security with modern multi-point locking
- ✓ Added property value and better kerb appeal
How to pay less for double glazing
Here is what most installers will not tell you: you may not have to pay the full price. Unlike a standard window company, Help 2 Buy Windows helps qualifying homeowners access ways to bring the cost right down, sometimes to nothing at all.
- ✓ Grants that can cover some or all of the cost for those who qualify
- ✓ Funding options, often with no upfront cost to get started
- ✓ Our Best 4 Less price guarantee on a like-for-like basis
Explore our double glazing grants, see what is on offer through the window replacement grant, or browse the full windows and doors scheme to understand your options.
Check if you qualify in 60 secondsWhat should your double glazing quote include?
A vague quote makes it impossible to compare prices fairly. Before you sign anything, make sure your quote clearly sets out the following:
- ✓ A full survey and accurate drawings of your windows
- ✓ The product specification, including style, colour and material
- ✓ The exact number of windows being supplied and fitted
- ✓ The Window Energy Rating of the glass and frames
- ✓ Handles, locks and any additional hardware
- ✓ Sills and any associated trims or finishings
- ✓ Clear start and finish dates for the installation
- ✓ Removal and disposal of your old windows
- ✓ Product and installation guarantees in writing
- ✓ Company accreditations such as DGCOS, Assure and FENSA
When should you replace your windows?
Windows do not last forever, and replacing them at the right time saves you money on rising bills and avoidable repairs. Look out for these tell-tale signs that it is time to upgrade:
- ✓ Draughts you can feel around the frames, even when closed
- ✓ Condensation between the panes, which means the sealed unit has failed
- ✓ Warped or discoloured frames that no longer open and close cleanly
- ✓ Rising energy bills as heat escapes through old, inefficient glazing
- ✓ Security concerns with worn locks or flimsy older frames
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Double glazing cost: your questions answered
How much is double glazing for a 3-bed house?
For a typical 3-bed semi with 8 to 10 windows, double glazing in uPVC usually costs between £4,000 and £8,000 supplied and fitted. The exact figure depends on the window styles you choose, the frame material and colour, glass specification and how easy your windows are to access. The only way to get an accurate price is a free, no-obligation survey, and you may qualify for a grant or funding that reduces what you pay.
Is double glazing cheaper than triple glazing?
Yes. Double glazing is generally cheaper than triple glazing because it uses two panes of glass rather than three. Triple glazing typically adds around 20 to 30 per cent to the cost of an equivalent double glazed window. Triple glazing offers better thermal and acoustic performance, so it can be worth the extra outlay on cold or noisy elevations, but double glazing remains the most cost-effective choice for most UK homes.
Can I get double glazing for free?
Some homeowners can have their double glazing installed with no upfront cost through a grant or funding, if they meet the qualifying criteria. Help 2 Buy Windows is not a government scheme, but we help qualifying homeowners access privately-funded grants and funding options. The best way to find out what you could get is to use our free funding checker, which gives an instant result in around 60 seconds.
How long does double glazing last?
Quality double glazing typically lasts 20 years or more when properly installed and maintained. The window frames often outlast the sealed glass units. If you see condensation forming between the panes, that is a sign the seal has failed and the unit may need replacing, even if the frame is still sound.
Does double glazing add value to my home?
Double glazing can add value to your home and make it easier to sell. Modern, energy-efficient windows improve your property's EPC rating, kerb appeal and comfort, all of which buyers look for. While the exact uplift varies by property and area, well-fitted double glazing is widely seen as a sound investment that pays back through lower energy bills as well as resale appeal.